Nannotax3 - ntax_main - Staurolithites mielnicensis

Citation: Staurolithites mielnicensis (Górka, 1957) Perch-Nielsen, 1968 sensu Crux 1982

Basionym: Discolithus mielnicensis Górka, 1957

Synonyms: Vagalapilla imbricata imbricata (Gartner 1958) sensu Bukry (1969) - according to Burnett 1997 the specimens illustrated by Bukry 1969 as V. imbricata imbricata are better placed in S. mielnicensis.

Taxonomic discussion: The type figure is almost featureless so it is not entirely clear why this name ended up applied to this species. [my interpretation - JRY 2019]

Distinguishing features:
Parent taxon (Staurolithites): Loxolith muroliths with relatively narrow rim and wide central area spanned by axial cross bars. The cross is usually spine bearing. Inner/proximal rim cycle is variably developed and so the LM image may be unicyclic or bicyclic. NB The bicyclic/unicyclic separation is simply controlled by how far the inwards the R-units develop so, although it is a useful identification criterion, it almost certainly has no real phylogenetic significance and would be a very poor character for defining genera.
This taxon: Bicyclic species with narrow rim, triangular feet to the crossbars give the species a distinctive LM appearance.

Geological Range:
Notes: FAD in Early Campanian, UC14b, in N Germany (Burnett 1998)
Last occurrence (top): within Maastrichtian Stage (66.04-72.17Ma, top in Maastrichtian stage). Data source: Burnett 1998
First occurrence (base): in upper part of UC11c subzone (80% up, 85.4Ma, in Santonian stage). Data source: Burnett 1998, fig 6.4

References:

al Rawahi, Z. & Dunkley Jones, T. (2019). Calcareous nannofossil assemblages of the Late Cretaceous Fiqa Formation, north Oman. Journal of Micropalaeontology. 38(1): 25-54. gs O

Bukry, D. (1969). Upper Cretaceous coccoliths from Texas and Europe. University of Kansas Paleontological Contributions, Articles. 51 (Protista 2): 1-79. gs O

Burnett, J. A. (1997c). New species and new combinations of Cretaceous nannofossils and a note on the origin of Petrarhabdus (Deflandre) Wise & Wind. Journal of Nannoplankton Research. 19(2): 133-146. gs

Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 132-199. gs O

Crux, J. A. (1980). A biostratigraphical study of Upper Cretaceous nannofossils from South-east England and North France. PhD thesis, University College London. -. gs

Crux, J. A. (1982). Upper Cretaceous (Cenomanian to Campanian) calcareous nannofossils. In, Lord, A. R. (ed.) A Stratigraphical Index of Calcareous Nannofossils. British Micropalaeontological Society Series, Ellis Horwood, Chichester 81-135. gs O

Górka, H. (1957). Les Coccolithophoridés du Maestrichtien supérieur de Pologne. Acta Palaeontologica Polonica. 2: 239-284. gs

Lord, A. R. (1982). A Stratigraphical Index of Calcareous Nannofossils. Ellis Horwood Limited, Chichester. -. gs

Thibault, N. (2010). Calcareous nannofossils from the boreal Upper Campanian- Maastrichtian chalk of Denmark. Journal of Nannoplankton Research. 31(1): 39-56. gs

Staurolithites mielnicensis

References:

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